If you want to build xcalib for use with AMD proprietaryFGLRX drivers, start the build script with a leading variable:

GPU=fglrx ./xcalib.SlackBuild

** Not having access to an AMD GPU, this is UNTESTED.

ICC PROFILES============Sample ICC profiles are included with this build, but you should use anICC profile for your monitor created by a spectrometer.An open source spectrometer is available from http://www.hughski.com/

Common industry ICC profiles from Adobe and the ECC are availablein the iccprofiles package here on SlackBuilds.org